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arch: arm: remove unnecessary stacking of r3 in swap.S

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Stacking r3 at this point is not required as the register value
is not used afterwards, therefore, it does not need to be
retained.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2019-02-11 08:53:13 +01:00 • committed by Kumar Gala
commit 29e98d2f8f
1 changed files with 3 additions and 5 deletions
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8
arch/arm/core/swap_helper.S
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@ -216,11 +216,9 @@ _thread_irq_disabled:
#ifdef CONFIG_BUILTIN_STACK_GUARD
/* clear stack pointer limit before setting the PSP */
push {r3}
mov r3, #0
msr PSPLIM, r3
pop {r3}
#endif
mov r0, #0
msr PSPLIM, r0
#endif /* CONFIG_BUILTIN_STACK_GUARD */
msr PSP, ip